Straightway valve.



PATEN-TED DEC. 1, 1903. E. S. BRADY. i STRAIGHTWAY VALVE.4 AA PPLIQA'HGNFILED AUG. 21, 15302.

N0 MODEL.

WITNESSES:

INVETOH l m4-7 ATTORNEY UNTTED STATES Patented December 1, 1903.

PATENT OEEICE.

EVERETT S. BRADY, OF BROOKLYN, NEW YORK, ASSIGNOR OF ONE-HALF TO ALBERTY. KING, OF NEW YORK, N. Y.

STRAIGHTWAY VALVE.

SPECIFICATION forming part of Letters Patent No. 745,774, dated December1, 1903.

Application filed August 2l, 1902. Serial No. 120,472. (No model.)

1!) all whom it may concern:

Be it known that I, EVERETT S. BRADY, a citizen of the United States,residing in the borough of Brooklyn, county of Kings, and

5 city and State of New York, have invented certain new and useful.Improvements in Straightway Valves, of which the following is aspecification.

This invention relates to valves for controlin ling,r the iiow of liuidsunder pressure, and particularly to the class of gate-valves orstraightway valves, so called; and the bject of the invention is toprovide a valvecontrolled by-pass for the iiuid at the top of .t themain gate-valve, the controlling by-pass valve seating downward orsubstantially perpendicular to the seating of the main valve and adaptedto be operated automatically by the same means that are employed foropenzo ing the main valve. The purpose of this bypass is to relieve thepressure on the main valve before it is opened by effecting a balancingot the pressure on both sides of said valve. v In the accompanyingdrawings, which illustrate two embodiments of the invention,Fig ures 1to 4 illustrate one of said embodiments. In these Fig. 1 is a sectiontaken along the axis of the pipe through which the duid flows 3o andalong the axis ofthe valve-operatingstem.

Fig. 2 is a transverse section of the valvecasiug, taken at line co2 inFig. 1, the valve being in elevation. Fig. 4 is a cross-section of thevalve-chest, showing the seat of the bypass valve; and Fig. 3 is asimilar section showing the by-pass valve in plan. Figs. 5, 6, and 7illustrate the other embodiment of the invention. Fig. 5 is a sectionsimilar to Fig. 1; and Figs. 6 and 7 are sections similar, 4orespectively, to Figs. 3 and 4.

In the 'first-named embodiment the operating-stem is non-rotative andmoves longitudinally when the valve is displaced, and in the last-namedembodiment the stem is rotative,

but does not move longitudinally, being collared.

Referring, primarily, to the tirst four figures of the drawings, 1represents a pipe or conduit through which a uid under pressure-as 5osteam, for example-flows in the direction indicated by the arrow .e inFig. 1. In the pipe is a valve-casing 2, having in it a seat 3 and on ita box 4. A gate-valve 5, which closes to the seat 3, serves tocontrolfthe How of iiuid through the pipe. The pressure of the fluidholds the gate-valve pressed up to its seat with a force correspondingto the area of the said valve in square inches multiplied by thepressure per square inch ofthe steam or other fiuid. In order to operatethe valve 5 and to 6o relieve the pressure of the fluid thereon at thetime of opening said valve, the mechanism now to be described isemployed.

6 is the operating-stem of the gate-valve. This stem is screw threadedand screws 65 through a nut 7, which has in it a circumferential groovethat is engaged by a sectional bearing 8, secured to the top ot' the box4. The nut 7 forms the hub or boss of a handwheel 9. The lower or innerend of the stem 7o 6 has a square head 10, which tits in a recess in theback or top of a by-pass valve 11, which rests on a seat 12 in avalve-chest 13, formed in the top of the gate-valve 5, controlling twopassages14 in the valve 5 and leading out 75 through the respectiveopposite faces thereof.

It may be stated here that the chest 13 is closed above by a screw-plug15, having in it a squared aperture to receive a tubular squared stem 16on the bypass valve. This 8o stem has a flange which is screwed to theback of the by-pass valve to form a cage or keeper for the headlO of thestem and keep the latter in its recess.

To operate the valve, the hand-wheel 9 :is 85 turned, thus rotating thecollared nut 7, which forms its hub. This has the effect to draw up thescrew-threaded stem 6, which cannot rotate, and thereby litt the by-passvalve 11 from its seat. This permits the duid to flow 9o by or over thevalve 5 by way of the passages 14 and equalize the pressure on bothsides thereof; 'but after the valve 11 has been elevated to a slight butsuficient extent its back engages the cover of the chest 13 and the 95further movement of the stem lifts or displaces the gate-valve 5 andopens a full passage for the steam or other fluid. The displaced, valvepasses into the box 4, which will be made steam-tight by means of astuflingroo box 17, through which plays the smooth or unthreaded portionof the operating-stem 6.

In Fig. 1 the middle portion of the box and stem are broken away forwant of room. In closing the valve to cut off the dow of Huid theby-pass valve 11 closes first and then the main valve 5 closes.

Obviously any form of valve 11 may be employed according to the form,size, and kind of gate-valve to which itis to be applied, and the stem 6may be coupled non-rotatively to the valve 11 in any way desired.Preferably, however, the coupling will be loose enough to allow thevalve a little freedom or play for seating evenly. The ports andpassages 14 may also be of any desired shape or form. In the embodimentdescribed the ports covered by the valve l1 open at the respective sidesof the center of the valve and are of a somewhat crescent shape incross-section. In some kinds of straightway valves this construction andarrangement is desirable as economizing available space.

In the embodiment of the invention illustrated in Figs. 5 to 7 and whichisy the form preferred where the space for placing the valve iscontracted the main Valve 5a is substantially the same as in thefirst-described embodiment, and the by-pass valve 11a is the same also,so far as its valve functions are concerned. In this embodiment,however, the inner end of the operating-stem 6a is screw-threaded andscrews through the valve 11a as a nut, and on the upper part of saidstem is a collar 10a in a bearing and keeper 18 exterior to and on thebox 4a. The hand-wheel 9 in this form is fixed on the outer end of theoperating-stem, and the stuing-box 1'7a is situated between the collarand the hand-wheel. The stem 16 in this construction is or may beintegral with the bypass valve. The ports 143, controlled by the by-passValve, are represented as disposed, respectively, in front of and back.of the center of the said valve or in a vertical plane perpendicular tothat of the said ports, as shown in Fig. 4. In Fig. 5, also, the valve11' is shown provided with packing ou its face, and the seats about theports 14a are shown as slightly elevated. These are not materialdifferences, but such as may be made under certain conditions to accordwith the judgment or particular views o f the constructor.

In the operation of the device, as shown in Fig. 5, the collaredscrew-stem 6L is rotated and first lifts the by-pass valve. Then themain valve lifts. The screw-stem passes through the main valve as thelatter lifts.

verse to the axis of the pipe through which the Huid Hows and theby-pass valve on the top of the gate-valve, with the plane of its seatsubstantially perpendicular to the seat of the main valve, the saidby-pass valve controlling ports in the main valve and being operated bythe same stem as the main valve. Obviously, also, the operating-stem maybe disposed above, below, or at the side, and the invention may beapplied to any valve to which it is adapted. The language of thedescription relates to the application of the invention as illustrated.

Having thus described my invention, I claim- 1. A main straightwayvalve, having a cylindrical valve-chest formed on its top andport-passages leading from opposite faces of the valve into said chest,a screw-plug 15 in and closing the top ot' said chest, said plug havingin it a square aperture, a circular bypass valve in said chest andhaving a tubular, square stem which ts and plays in the aperture in theplug 15, and the lifting valvestem engaging said squared tubular stem onthe by-pass valve, substantially as set forth.

2. A main straightway valve, having a cylindrical valve-chest formed onits top, ports in the bottom of said chest disposed in a plane at rightangles to the main conduit,-

passages in the main valve connecting the opposite faces of the latterwith the respective ports, a by-pass valve in said chest, said valvehaving a square, tubular stem, a screwplug in and closing the top of thevalve-chest and having in it a square aperture through which extends thesquare stem on the bypass valve, and the lifting-stem connected with theby-pass valve.

In witness whereof I have hereunto signed my name, this 19th day ofAugust, 1902, in the presence of two subscribing witnesses.

EVERETT S. BRADY.

Witnesses:

HENRY CoNNETr, PETER A. Ross.

IOO y

